Micro Systems Flashcards
dominant flora in skin
staph epi
dominant flora in nose? what can colonize the anterior nares?
stap epi; staph aureus colonizes
dominant flora in oropharnyx
strep viridans
Dominant flora in a dental plaque
strept mutans
2 Dominant flora of the colon
bacteroides fragilis > E.coli
dominant flora of the vagina? what 2 species can colonize it?
lactobacillus; colonized by E. coli and GBS
what is significant about neonates delivered by C-section in terms of normal flora?
they have no flora at birth, but are rapidly colonized after birth
which 2 bugs cause food poisoning that starts rapidly and ends rapidly?
Staph aureus; Bacillus cereus
2 bugs that cause food poisoning from contaminated seafood
Vibrio parahemolyticus; Vibrio vulnificus
Which bug can cause wound infections from contact with contaminated water/shellfish?
Vibrio vulnificus
Food poisoning from reheated rice?!
Be serious = Bacillus cereus
Food poisoning from meats, mayonnaise, and custard via a pre-formed toxin
Staph aureus
food poisoning from reheated meat dishes
clostridium perfringens
food poisoning from improperly canned foods? what might be a hint?
clostridium botulinum. bulging cans are suspicious
food poisoning from undercooked meat such as hamburgers?
E. coli O157:H7
food poisoning from poultry, meat, or eggs
Salmonella
name 3 bugs that can mimic appendicitis
- yersinia enterocolitica = MCC mesenteric adenitis of peyer’s patches
- non-typhoidal salmonella = mesenteric adenitis of peyer’s patches
- campylobacter jejuni
name 7 bugs that cause bloody diarrhea
(C)an’t (S)top (S)***ting (E)(E)r(Y)throcyt(E)s
- Campylobacter (Puppies, livestock, ingestion of undercooked meat)
- Salmonella (Lactose neg, flagellar motility, has animal reservoir, esp. poultry & eggs)
- Shigella (Lactose neg, very low ID50, produces Shiga toxin; human reservoir only)
- EHEC (can cause HUS; Shiga-like toxin)
- EIEC (invades colonic mucosa)
- Yersinia enterocolitica (daycare outbreaks; pseudoappendicitis)
- Entamoeba histolytica (also “anchovy-paste” exudate on liver abscesses)
comma- or s-shaped organism that grows at 42C and causes bloody diarrhea
Campylobacter “likes the campfire” @ 42C
lactose negative organism with flagellar motility. has an animal reservoir, especially poultry and eggs. causes bloody diarrhea
salmonella
lactose negative. very low infectious dose. humans are the only reservoir for this toxin-producing bad boy. causes bloody diarrhea
shigella
O157:H7 is a strain of this bug. causes bloody diarrhea, HUS, and makes a shiga-like toxin
EHEC
gram negative rod that invades the colonic mucosa and can cause bloody diarrhea
EIEC
day-care outbreaks + pseudoappendicitis + bloody diarrhea
yersinia entercolitica